s=input().strip()
s2=""
arr=list()
sum=0
for i in s:
    if i.lower() not in arr and i.isalpha() and i.upper() not in arr:
        arr.append(i)
        sum+=1
    if sum==10:
        break
if sum==10:
    for i in arr:
        print(i,end='')
else:
    print("not found")